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Strain rate effect on the acoustic emission characteristics of concrete under uniaxial tension

  • Yan Wang , Na Wang , Chao Yan , Tingting Zhang , Lijun Chen and Jie Gu
Published/Copyright: December 20, 2019
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Materials Testing
From the journal Materials Testing Volume 62 Issue 1

Abstract

Concrete is an important engineering material whose tensile property plays an important role in structural safety. Thus, the effect of strain rate on crack evolution in concrete during tension cracking cannot be neglected. Within a strain rate range of 10−6 to 10−4 s−1, an acoustic emission monitoring test for the whole process of concrete under uniaxial tension including the post-peak softening stage was conducted. Moreover, damage evolution, along with the cracking mechanism of concrete at various strain rates was discussed with respect to the effect of strain rate on acoustic emission. The results show that the acoustic emission activity of concrete is delayed due to an increase in strain rate. This indicates that the hysteresis of deformation and cracking can be observed in a uniaxial tension test of concrete. During the whole loading process, as the strain rate increased, the average level of the acoustic emission hit rate increased significantly, indicating that an increase in strain rate accelerates crack initiation and propagation in concrete. Average acoustic emission values, duration and energy also show an increasing trend, and the scatter distribution range between them and the acoustic emission amplitude changes significantly, a fact that can be used to identify the damage degree of concrete under different strain rates. A peak frequency and cd4 band wavelet energy spectrum coefficient tends to decrease, while the ca8 band wavelet energy spectrum coefficient increases. In other words, the proportion of low frequency acoustic emission signals increases, indicating that an increase in strain rate increases the proportion of macroscopic cracks in concrete. At various strain rates, the average level of acoustic emission characteristic parameters and the proportion of high frequency signals at the post-peak stage in concrete are higher than those at the pre-peak stage, indicating that the development of microcracks in concrete mainly concentrates during the post-peak softening stage.

∗Correspondence Address, Associate Prof. Dr. Yan Wang, College of Civil and Transportation Engineering, Hohai University, Nanjing, 210024, China, E-mail:

Associate Prof. Dr. Wang Yan, born in 1980, studied Civil Engineering at Hohai University, China, from 2000 till 2009. There, he finished his PhD on the damage assessment and damage mechanism of concrete based on acoustic emission technology in 2009 and and began teaching at the university in the same year. The focus of his research lies on the damage study of concrete based on acoustic emission and ultrasonic technique.

MEng Wang Na, born in 1995, has been studying Civil Engineering at Hohai University, China, since 2017. Her research focuses on the damage process of concrete and reinforced concrete based on acoustic emission analysis technique and method.

MEng Yan Chao, born in 1994, has been studying Civil Engineering at Hohai University, China, since 2017. Her research focuses on the damage process of concrete based on acoustic emission wavelet analysis technique.

MEng Zhang Ting Ting, born in 1993, has been studying Civil Engineering at Hohai University, China, since 2016. Her research focuses on the whole damage process of concrete based on acoustic emission fractal theory.

MEng Chen Li Jun, born in 1996, has been studying Civil Engineering at Hohai University, China, since 2018. Her research focuses on the damage characteristics of reinforced concrete based on the acoustic emission analysis technique.

MEng Gu Jie, born in 1995, has been studying Civil Engineering at Hohai University, China, since 2018. Her research focuses on the damage characteristics of concrete based on acoustic emission and neural networks.

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Published Online: 2019-12-20
Published in Print: 2020-01-07

© 2020, Carl Hanser Verlag, München

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Strain rate effect on the acoustic emission characteristics of concrete under uniaxial tension
  5. Characterization of thick carbon/basalt hybrid fiber polyester composites with graphene nanoplatelets
  6. Influence of powder nitriding on the mechanical behavior of laser-powder bed fusion processed tool steel X30CrMo7-2
  7. Consideration of imperfections and support effects in the fatigue assessment of welded cruciform joints
  8. Roll optimization via numerical modeling of stress distribution
  9. Submerged arc welding of Ramor 500 Steel and numerical modeling of the residual stress
  10. Life extension heat treatment of IN 783 bolts
  11. Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element
  12. Innovative characterization and mechanical properties of natural cellulosic Coccinia Indica fiber and its composites
  13. Post-weld heat treatment effects on the tensile properties of cold metal arc welded AA 6061-T6 aluminum joints
  14. Wear and corrosion behavior of coconut shell ash (CSA) reinforced Al6061 metal matrix composites
  15. Optimization of cutting parameters with respect to roughness for machining of hardened AISI 1040 steel
  16. Shunting effects on the resistance spot welding parameters of DP600
  17. Properties of P460-S355 submerged arc welds
  18. BEZUGSQUELLEN
  19. Materials Testing
https://doi.org/10.3139/120.111445

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Strain rate effect on the acoustic emission characteristics of concrete under uniaxial tension
  5. Characterization of thick carbon/basalt hybrid fiber polyester composites with graphene nanoplatelets
  6. Influence of powder nitriding on the mechanical behavior of laser-powder bed fusion processed tool steel X30CrMo7-2
  7. Consideration of imperfections and support effects in the fatigue assessment of welded cruciform joints
  8. Roll optimization via numerical modeling of stress distribution
  9. Submerged arc welding of Ramor 500 Steel and numerical modeling of the residual stress
  10. Life extension heat treatment of IN 783 bolts
  11. Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element
  12. Innovative characterization and mechanical properties of natural cellulosic Coccinia Indica fiber and its composites
  13. Post-weld heat treatment effects on the tensile properties of cold metal arc welded AA 6061-T6 aluminum joints
  14. Wear and corrosion behavior of coconut shell ash (CSA) reinforced Al6061 metal matrix composites
  15. Optimization of cutting parameters with respect to roughness for machining of hardened AISI 1040 steel
  16. Shunting effects on the resistance spot welding parameters of DP600
  17. Properties of P460-S355 submerged arc welds
  18. BEZUGSQUELLEN
  19. Materials Testing
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